Answer:
ΔH°r = -114.40 kJ
Explanation:
Let's consider the following balanced equation.
4 HCl(g) + O₂(g) ⇒ 2 H₂O(g) + 2 Cl₂(g)
We can calculate the standard enthalpy change of the reaction (ΔH°r) using the following expression.
ΔH°r = ∑np × ΔH°f(p) - ∑nr × ΔH°f(r)
where
ΔH°f: standard heat of formation n: moles p: products r: reactantsΔH°r = 2 mol × ΔH°f(H₂O(g)) + 2 mol × ΔH°f(Cl₂(g)) - 4 mol × ΔH°f(HCl(g)) - 1 mol × ΔH°f(O₂(g))
ΔH°r = 2 mol × (-241.82 kJ/mol) + 2 mol × 0 kJ/mol - 4 mol × (-92.31 kJ/mol) - 1 mol × 0 kJ/mol
ΔH°r = -114.40 kJ
You will prepare a 237.5 ml kool-aid solution with a concentration of 1M. The molar mass of kool-aid (or sugar since kool-aid is basically sugar C12H22O11.) is 342 g/mol. Show the
calculations below which helped you create your 1M solution. Note: 237.5 mL is approximately one cup.
Please show your work here.
Liters of water needed __
Molarity of kool-aid needed __
Grams of kool-aid needed __
The mass of the kool aid needed to prepare the solution is 81.2 g.
What is concentration?The term concentration has to do with the amount of substance present in solution. We are told to make calculations regarding the preparation of a 237.5 ml kool-aid solution with a concentration of 1M.
Litres of water needed = 237.5/1000 = 0.2375 L
Molarity of kool-aid needed = 1 M
number of moles = 1 M * 0.2375 L = 0.2375 moles
0.2375 moles = mass of kool aid/molar mass
0.2375 moles = mass/ 342 g/mol
mass = 0.2375 moles * 342 g/mol
mass = 81.2 g
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A student left a sealed jar of water outside her home. Water can be a solid,
liquid, or gas. When she put it outside, the water was a solid. Twelve hours
later, the water had changed phase and was a liquid. What happened to
the water molecules?
a) Before the student left, the molecules were moving in place. After, the molecules were moving around each other.
b) Before the student left, the molecules were moving around each other. After, the
molecules were moving away from each other.
c) Before the student left, the molecules were moving around each other. After, the
molecules were moving in place.
d) Before the student left, the molecules were moving away from each other. After, the
molecules were moving around each other.
i think the answer is d) Before the student left, the molecules were moving away from each other. After, the
molecules were moving around each other.
I am sorry if the answer is wrong
Do alloys require a specific amount of ingredients to form?
Answer:
No, alloys are independent of the amount of it's constituents.
Alloys depend on the number of it's constituents.
Only strength of alloys depends on the specific amount of ingredients/constituents/elements.
what is your experience about water pollution
Answer:
water pollution is a process in which water gets polluted due to discharge of city sewage and industrial waste. I was suffering through the water born disease when I drank the contaminated water. The sources of water becomes dirty. It makes environment unbalanced. People suffer from different water born disease when they drink polluted water.
how many moles are in 1.25x10^20 molecules of HF?
Answer:
1.25×10²⁵ molecules of ethane contains 124.56 moles of Hydrogen atoms.
What is the percent of Cu in CuSO4?
Asolutioncontains50gofsugarin250g ofwater.Calculatetheconcentrationin termsofmassbymasspercentageofthe solution.
Can somebody please help me!!
Answer:
acceleration
pls dont report me
If I place a pot of water over a fire (heat source), what will happen to the water?
None of the water will get warm.
All of the water will get warm.
Only the water on top will get warm.
Only the water closest to the source will get warm
Answer:
C. All of the water will get warm.
Explanation:
The water will get warm all together but slowly, eventually when it hits a certain high heated temperature it will start to boil.
Which is an example of technology leading to a new discovery?
A. A truck is used to ship goods between two states.
B. A telescope shows that there is a planet past Neptune
C. An irrigation system is installed at a farm.
D. An antibiotic is used to treat an infection.
Answer:
I think the answer would be B, because there is still stuff past the known exception of out private solar system. (and all the other options don't discover anything.)
A piece of Li is
dropped into water
and catches fire
producing LiOH
is a Chemical or physical change
Click on an olive tree and read about it. Based on what you read, do you think the climate of Barcelona is very wet or rather dry? Explain.
Answer:
In the Autumn, Spring, and Winter, It is wet. In the Summer it is dry.
Explanation:
Convert 467.00 g AlCl3 to mol AlCl3.
Answer:
467.000g AICI3 to mol AICI3
Explanation
Answer:
7.49959 mol i hope this is right
A box of pills claims that they will make your cold go away sooner. Who
would be the most impartial source for information on this claim?
A. The company that makes the medicine
B. The store that sells the medicine
C. A company that makes a competing medicine
.
D. A university study that tests medicine
Answer:D
Explanation:
CsBr formula name???
Answer
PubChem CID/molecular formula
Explanation:
Cesium bromide
PubChem CID 24592
Molecular Formula CsBr or BrCs
Synonyms CESIUM BROMIDE 7787-69-1 Caesium bromide Cesiumbromide Cesium bromide (CsBr) More...
Molecular Weight 212.81 g/mol
Component Compounds CID 260 (Hydrogen bromide) CID 5354618 (Cesium)
have a good day /night
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When the concentration of reactant molecules is increased
Complete question is;
When the concentrations of reactant molecules are increased, the rate of reaction increases. The best explanation for this phenomenon is that as the reactant concentration increases,
A)the average kinetic energy of molecules increases.
B)the frequency of molecular collisions increases.
C)the rate constant increases.
D)the activation energy increases.
E)the order of reaction increases.
Answer:
B) The frequency of molecular collisions increases.
Explanation:
When we increase number of reactant molecules, the effective collision between the reactant molecules will form a product which also increases. As a result, the overall rate of the reaction will also increase which means the frequency of the molecular collision will also increase as well.
Thus, the correct answer is Option B
Write the chemical symbols for three different atomic cations that all have 14 protons.
Explanation:
The symbols for three different cations with 14 protons are Si²⁺, Si⁴⁺, and Si³⁺. An element with 14 protons must be silicon, Si. Its electron configuration is [Ne] 3s²3p², so it could lose up to four valence electrons. The most likely cations are Si²⁺, Si⁴⁺, and Si³⁺ (or Si⁺)
For each of the following, predict the complete, balanced chemical equation for the reaction that occurs when they are mixed. Make sure to label the states.
1. HNO3 & NaOH
2. Sr(OH)2 & HI
.
Answer:
1. The balanced chemical reaction is:
[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]
2. The balanced chemical reaction is:
[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reactions, it is necessary to keep in mind the cations and anions are switched around as a result of the bonds rearrangement in these neutralization reactions; therefore, we can proceed as follows:
1. The balanced chemical reaction is:
[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]
Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.
2. The balanced chemical reaction is:
[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]
Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.
Best regards!
A 50.0 mL sample of buffer solution contains 0.120 M acetic acid and 0.150 M sodium acetate. If 5.55 mL of 0.092 M NaOH is added to this solution, identify the resulting number of moles of acetic acid, sodium acetate, and NaOH.
Answer:
see calculations below
Explanation:
Given: HOAc ⇄ [H⁺] + [OAc⁻]
C(i) 0.12M 0M 0.15M
mix => 5.55ml(0.092M NaOH) / (50ml + 5.55ml)
= 0.00555(0.092)mole NaOH / 0.0555 L Soln
= 0.0092M in NaOH is added into the initial buffer solution
= 0.0092M in OH⁻ (NaOH is a strong base => 100% ionized)
Rxn => Addition of 0.0092M OH⁻ will react with 0.0092M H⁺ shifting buffer . equilibrium to the right decreasing [HOAc] and increasing [OAc⁻] by . 0.0092M each.
Therfore ...
Given: HOAc ⇄ [H⁺] + [OAc⁻]
C(i) 0.12M 0M 0.15M
ΔC - 0.0092M +x +0.0092M
C(f) 0.1108M x 0.1592M => New Concentrations . after adding 0.0092M . NaOH
Substituting new acid and ion concentrations into Ka expression ...
Ka = [H⁺][OAc⁻]/[HOAc] = (x)(0.1592M)/(0.1108M) = 1.75 x 10⁻⁵M
=> x = [H⁺](new) = (1.75 x 10⁻⁵M*)(0.1108M)/(0.1592M) = 1.22 x 10⁻⁵M in H⁺ ions
*units of Ka are Molar
FYI => Adding a strong base to a buffer solution will shift pH to more basic.
Adding a strong acid to a buffer solution will shift pH to more acidic.
=> (such is a good way to check that your buffer calculations are correct.)
NOTE => Question asks for moles of HOAc, Na⁺OAc⁻ & NaOH after adding base. Giving answers in terms of Molarity (moles/Liter) is same as moles. Therefore ...
[HOAc] = 0.1108M
[NaOAc] = 0.1592M
[NaOH] = ∅M (from rxn of H⁺ + OH⁻ => H₂O, all NaOH was consumed in acid/base reaction. Remaining are only Na⁺ as a spectator ion and OH⁻ as a function of the new concentration of H⁺ => [OH⁻] = Kw/[H⁺] = 1 x 10⁻¹⁴/1.22 x 10⁻⁵ = 8.2 x 10⁻¹⁰M.
Hope this helps. :-)
Pleaseee helpp ASAP!!
How do temperature and pressure affect the volume of a gas?
Answer:
At constant pressure on increasing the temp volume also increases
and on increasing the pressure volume of given substance decreases !
intermolecular dehydration of alkanols will gives what?
Answer:
One way to synthesize alkenes is by dehydration of alcohols, a process in which alcohols undergo E1 or E2 mechanisms to lose water and form a double bond. The dehydration reaction of alcohols to generate alkene proceeds by heating the alcohols in the presence of a strong acid, such as sulfuric or phosphoric acid, at high tempera (sorry if this is wrong )
Which of these changes would likely occur if the Earth's rotation on its axis
increased in speed? TEKS 8.7(A)
A The length of the seasons would be shorter.
B The length of the seasons would be longer.
C The length of a day would be shorter.
D The length of a day would be longer.
Answer: its c
Explanation:
Scientists are trying to understand the composition of substances on
different planets. Which best describes how scientists are probably working
on this problem?
A. Scientists share information with other scientists who approach
the problem in the same way so that they get support for their
observations.
B. Scientists with different perspectives approach the problem in
various ways, but they all make observations and look for
patterns.
O C. Scientists with the same perspectives use similar experiments so
that they can compare results and draw the same conclusions.
D. Scientists study the problem in the same way because they have
similar backgrounds and share information with each other.
Which of the following is an example of a physical property?
A- Luminol reacting with blood stains to create a faint light
B- Bleach changing the color of a Ph test strip
C- The thickness of glass shards from a crime scene
D- Heroin turning purple when it is exposed to Marquis reagent
Answer:
The answer is C
Explanation:
It just makes the most sense to me
please answer's these scientist answer's
A scientist observes that the leg bones of cats are similar to the bones in the wings of bats. The scientist concludes the two species share a common ancestor. Which describes why the scientist drew that conclusion?
1. developmental patterns
2. DNA
3. fossil evidence
4 .structural data
Bald eagles might lay up to five eggs at a time, but only one hatchling usually survives. Which feature of natural selection is this an example of?
1 .adaptation
2. genetic variation
3. overproduction
4. selection
need help on assignment email me at shahlaalgow g mail . com
Explanation:
sure I will email you but it says that the email you have put is not correcthave a good day ☺️
What two variables are needed to calculate molarity?
A.Grams of solution, liters of solute
B.Moles of solute, liters of solution
C.Liters of solute, grams of solution
D.Liters of solute, moles of solution
Which of the following would make experimental results more reliable? A. choosing the data that match the hypothesis B. performing the experiment multiple times C. increasing the number of variables in the experiment D. adding the experimenter's opinion to the conclusions
I think the answer is C. (Increasing the number of variables in the experiment)
Answer:
ITS B
Explanation:
THE OTHER GUY WAS WRONG
Which two changes would make this reaction product-favored? 3H2 + N2 ⇄ 2NH3 + energy  A. Decreasing the pressure  B. Increasing the temperature  C. Increasing the pressure  D. Reducing the temperature
Answer:C and D
Explanation:Just did it
Increasing the pressure and Decreasing the temperature are the two changes would make this reaction product-favored.
What is Equilibrium ?It is a state when a reaction is reversible and both forward and reverse reaction occur simultaneously at the same rate .
In the process of manufacture of Ammonia , both forward and reverse reaction are taking place
N₂(g) + 3H₂ (g) → 2NH₃ (g)
2NH₃(g) → N₂ (g) + 3H₂ (g)
when these reaction occur at same rate , the state is called equilibrium and is represented by
N₂ (g) + 3H₂(g) ⇔ 2NH₃(g) +Heat
As we can see from the equation , heat is produced in the forward reaction so if we increase the temperature the reverse reaction will be favored ,
On decreasing temperature the reaction will become product favored .
While on increasing the Pressure the manufacture of Ammonia increases.
Therefore Option C and Option D are the two changes would make this reaction product-favored.
To know more about Equilibrium
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Choose the options below that are true of chemical equilibria.
A. The reaction proceeds in the forward and reverse directions at the same rate.
B. Both the forward and the reverse reactions are achievable.
C. The relative amounts of all species must be different.
D. There is no net change in concentrations of reactants and products.
Answer:
A. The reaction proceeds in the forward and reverse directions at the same rate.
B. Both the forward and the reverse reactions are achievable.
D. There is no net change in concentrations of reactants and products.
Explanation:
Chemical equilibrium can be defined as the state of a reversible reaction in which the concentration (rate) of the forward reaction is equal to the concentration (rate) of the backward or reverse reaction. Thus, both the reactants and products of the chemical equation don't have the tendency to change with respect to time.
Hence, the options that are true of chemical equilibria include the following;
I. The reaction moves in both forward and reverse directions simultaneously i.e at the same rate.
II. The chemical equation can attain both forward and reverse reactions.
III. The concentrations of both reactants and products are the same i.e there's no net change.
Answer:
A B D knewton
Explanation: